Ubuntu updater updated virtualbox components while Virtualbox was running, resulting in this issue

[Christopher Grey]

As described in the title, I had Virtualbox open and running a VM at the moment Ubuntu's software updater attempted to update a Vbox component. Instead of gracefully failing with a message indicating that VBox needs to be shutdown before installing OR prompting to shutdown VBox before continuing, it resulted in a crash of the installer, which triggered the Ubuntu installer to catch the failure and guide me to filling out this bug report.

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: virtualbox-ext-pack 5.1.38-0ubuntu1.16.04.1
ProcVersionSignature: Ubuntu 4.13.0-45.50~16.04.1-generic 4.13.16
Uname: Linux 4.13.0-45-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
Date: Mon Aug 6 07:44:02 2018
ErrorMessage: subprocess installed post-installation script returned error exit status 4
InstallationDate: Installed on 2018-04-16 (112 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
PackageArchitecture: all
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.4
 apt 1.2.27
SourcePackage: virtualbox-ext-pack
Title: package virtualbox-ext-pack 5.1.38-0ubuntu1.16.04.1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 4
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.